What is E on thermostat wiring?
What is E on thermostat wiring?
E. Some thermostats for heat pumps have an E terminal, which toggles emergency heat on or off. Emergency heat should only be used on very cold days when the heat pump is unable to keep the house warm.
Where does the e wire go on a thermostat?
The E terminal has a back-up heat source. If you have a heat pump package unit, the E terminal should be wired directly to the heating relay or the stripboard of the air handler.
What color wire is W2 on thermostat?
General Thermostat Wiring Color Code
👉 For more insights, check out this resource.
| Terminal | Wire Color |
|---|---|
| W2 | Brown |
| G | Green |
| C | Blue/Black |
| O/B | Orange/Dark Blue |
Is W2 and e wire the same?
W2 is generally called on based on a temperature differential between setpoint and space, outdoor temperature, or run time. W3 – This is just the next stage of heat after W2. E – Is emergency heat, usually just a way to manually drive on what would normally be the secondary form of heat without stage 1 heating.
Is W the same as W2 on thermostat?
W – This is the thermostat terminal for heating. W2 – This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal.
👉 Discover more in this in-depth guide.
Do I need the E wire on my thermostat?
Some thermostats have an E wire. The E wire controls emergency heating. Emergency heat is used when the HVAC system is not functioning properly (usually when the compressor is out of service). When you set a thermostat to emergency heat, the system bypasses the compressor and directly accesses the electric heat strip.
What does W e mean on thermostat?
W: Auxiliary heat, stage 1. E: Emergency heat (In emergency mode “Y” is not energized and E is energized to indicate the need for emergency heat. This mode is used if the heat pump fails during cold winter temperatures and the compressor must remain off.)
What do you do with a W2 wire thermostat?
W2 – This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal. Brown for W2 Terminal.
What is W AUX on thermostat?
“Aux” is short for auxiliary heat. If a heat pump is having a difficult time coming up to a certain temperature quickly due to extremely cold outdoor temperatures, the “aux heat” indicator means that a secondary heat source (generally gas or electric) has been deployed.
What is e W1 on a thermostat?
E normally stands for Emergency Heat. W1 means single stage heat (probably what you have) but without knowing what your HVAC does its hard to tell.
What is W2 aux on Nest?
If the heat pump can’t heat the house, the W2/Aux wire will signal the electric elements in the air handler to come on and help out. Those electric elements can also be used as “emergency” heat if the heat pump doesn’t work. I just replaced the same thermostat with new Nest.
What is the Y1 wire on a thermostat?
Y or Y1. In most systems, the Y or Y1 wire controls your cooling system. If you have a heat pump, your Y or Y1 wire controls your compressor. Your compressor is responsible for heating and cooling your home.
